summaryrefslogtreecommitdiffstats
path: root/twinstall.cpp
blob: 91a1a359592295dee5ddd2d2b09151380f0243f3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
/*
	Copyright 2012 bigbiff/Dees_Troy TeamWin
	This file is part of TWRP/TeamWin Recovery Project.

	TWRP is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	TWRP is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with TWRP.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>

#include <string.h>
#include <stdio.h>

#include "twcommon.h"
#include "mincrypt/rsa.h"
#include "mincrypt/sha.h"
#include "minui/minui.h"
#include "mtdutils/mounts.h"
#include "mtdutils/mtdutils.h"
#include "minzip/SysUtil.h"
#include "minzip/Zip.h"
#include "verifier.h"
#include "variables.h"
#include "data.hpp"
#include "partitions.hpp"
#include "twrpDigest.hpp"
#include "twrp-functions.hpp"
extern "C" {
	#include "gui/gui.h"
	#include "legacy_property_service.h"
}

static const char* properties_path = "/dev/__properties__";
static const char* properties_path_renamed = "/dev/__properties_kk__";
static bool legacy_props_env_initd = false;
static bool legacy_props_path_modified = false;

static int switch_to_legacy_properties()
{
	if (!legacy_props_env_initd) {
		if (legacy_properties_init() != 0)
			return -1;

		char tmp[32];
		int propfd, propsz;
		legacy_get_property_workspace(&propfd, &propsz);
		sprintf(tmp, "%d,%d", dup(propfd), propsz);
		setenv("ANDROID_PROPERTY_WORKSPACE", tmp, 1);
		legacy_props_env_initd = true;
	}

	if (TWFunc::Path_Exists(properties_path)) {
		// hide real properties so that the updater uses the envvar to find the legacy format properties
		if (rename(properties_path, properties_path_renamed) != 0) {
			LOGERR("Renaming %s failed: %s\n", properties_path, strerror(errno));
			return -1;
		} else {
			legacy_props_path_modified = true;
		}
	}

	return 0;
}

static int switch_to_new_properties()
{
	if (TWFunc::Path_Exists(properties_path_renamed)) {
		if (rename(properties_path_renamed, properties_path) != 0) {
			LOGERR("Renaming %s failed: %s\n", properties_path_renamed, strerror(errno));
			return -1;
		} else {
			legacy_props_path_modified = false;
		}
	}

	return 0;
}

static int Run_Update_Binary(const char *path, ZipArchive *Zip, int* wipe_cache) {
	const ZipEntry* binary_location = mzFindZipEntry(Zip, ASSUMED_UPDATE_BINARY_NAME);
	string Temp_Binary = "/tmp/updater";
	int binary_fd, ret_val, pipe_fd[2], status, zip_verify;
	char buffer[1024];
	const char** args = (const char**)malloc(sizeof(char*) * 5);
	FILE* child_data;

	if (binary_location == NULL) {
		mzCloseZipArchive(Zip);
		return INSTALL_CORRUPT;
	}

	// Delete any existing updater
	if (TWFunc::Path_Exists(Temp_Binary) && unlink(Temp_Binary.c_str()) != 0) {
		LOGINFO("Unable to unlink '%s'\n", Temp_Binary.c_str());
	}

	binary_fd = creat(Temp_Binary.c_str(), 0755);
	if (binary_fd < 0) {
		mzCloseZipArchive(Zip);
		LOGERR("Could not create file for updater extract in '%s'\n", Temp_Binary.c_str());
		return INSTALL_ERROR;
	}

	ret_val = mzExtractZipEntryToFile(Zip, binary_location, binary_fd);
	close(binary_fd);

	if (!ret_val) {
		mzCloseZipArchive(Zip);
		LOGERR("Could not extract '%s'\n", ASSUMED_UPDATE_BINARY_NAME);
		return INSTALL_ERROR;
	}

	// If exists, extract file_contexts from the zip file
	const ZipEntry* selinx_contexts = mzFindZipEntry(Zip, "file_contexts");
	if (selinx_contexts == NULL) {
		mzCloseZipArchive(Zip);
		LOGINFO("Zip does not contain SELinux file_contexts file in its root.\n");
	} else {
		string output_filename = "/file_contexts";
		LOGINFO("Zip contains SELinux file_contexts file in its root. Extracting to %s\n", output_filename.c_str());
		// Delete any file_contexts
		if (TWFunc::Path_Exists(output_filename) && unlink(output_filename.c_str()) != 0) {
			LOGINFO("Unable to unlink '%s'\n", output_filename.c_str());
		}

		int file_contexts_fd = creat(output_filename.c_str(), 0644);
		if (file_contexts_fd < 0) {
			mzCloseZipArchive(Zip);
			LOGERR("Could not extract file_contexts to '%s'\n", output_filename.c_str());
			return INSTALL_ERROR;
		}

		ret_val = mzExtractZipEntryToFile(Zip, selinx_contexts, file_contexts_fd);
		close(file_contexts_fd);

		if (!ret_val) {
			mzCloseZipArchive(Zip);
			LOGERR("Could not extract '%s'\n", ASSUMED_UPDATE_BINARY_NAME);
			return INSTALL_ERROR;
		}
	}
	mzCloseZipArchive(Zip);

#ifndef TW_NO_LEGACY_PROPS
	/* Set legacy properties */
	if (switch_to_legacy_properties() != 0) {
		LOGERR("Legacy property environment did not initialize successfully. Properties may not be detected.\n");
	} else {
		LOGINFO("Legacy property environment initialized.\n");
	}
#endif

	pipe(pipe_fd);

	args[0] = Temp_Binary.c_str();
	args[1] = EXPAND(RECOVERY_API_VERSION);
	char* temp = (char*)malloc(10);
	sprintf(temp, "%d", pipe_fd[1]);
	args[2] = temp;
	args[3] = (char*)path;
	args[4] = NULL;

	pid_t pid = fork();
	if (pid == 0) {
		close(pipe_fd[0]);
		execve(Temp_Binary.c_str(), (char* const*)args, environ);
		printf("E:Can't execute '%s'\n", Temp_Binary.c_str());
		_exit(-1);
	}
	close(pipe_fd[1]);

	*wipe_cache = 0;

	DataManager::GetValue(TW_SIGNED_ZIP_VERIFY_VAR, zip_verify);
	child_data = fdopen(pipe_fd[0], "r");
	while (fgets(buffer, sizeof(buffer), child_data) != NULL) {
		char* command = strtok(buffer, " \n");
		if (command == NULL) {
			continue;
		} else if (strcmp(command, "progress") == 0) {
			char* fraction_char = strtok(NULL, " \n");
			char* seconds_char = strtok(NULL, " \n");

			float fraction_float = strtof(fraction_char, NULL);
			int seconds_float = strtol(seconds_char, NULL, 10);

			if (zip_verify)
				DataManager::ShowProgress(fraction_float * (1 - VERIFICATION_PROGRESS_FRACTION), seconds_float);
			else
				DataManager::ShowProgress(fraction_float, seconds_float);
		} else if (strcmp(command, "set_progress") == 0) {
			char* fraction_char = strtok(NULL, " \n");
			float fraction_float = strtof(fraction_char, NULL);
			DataManager::SetProgress(fraction_float);
		} else if (strcmp(command, "ui_print") == 0) {
			char* display_value = strtok(NULL, "\n");
			if (display_value) {
				gui_print("%s", display_value);
			} else {
				gui_print("\n");
			}
		} else if (strcmp(command, "wipe_cache") == 0) {
			*wipe_cache = 1;
		} else if (strcmp(command, "clear_display") == 0) {
			// Do nothing, not supported by TWRP
		} else {
			LOGERR("unknown command [%s]\n", command);
		}
	}
	fclose(child_data);

	waitpid(pid, &status, 0);

#ifndef TW_NO_LEGACY_PROPS
	/* Unset legacy properties */
	if (legacy_props_path_modified) {
		if (switch_to_new_properties() != 0) {
			LOGERR("Legacy property environment did not disable successfully. Legacy properties may still be in use.\n");
		} else {
			LOGINFO("Legacy property environment disabled.\n");
		}
	}
#endif

	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
		LOGERR("Error executing updater binary in zip '%s'\n", path);
		return INSTALL_ERROR;
	}

	return INSTALL_SUCCESS;
}

extern "C" int TWinstall_zip(const char* path, int* wipe_cache) {
	int ret_val, zip_verify = 1, md5_return, key_count;
	twrpDigest md5sum;
	string strpath = path;
	ZipArchive Zip;

	if (strcmp(path, "error") == 0) {
		LOGERR("Failed to get adb sideload file: '%s'\n", path);
		return INSTALL_CORRUPT;
	}

	gui_print("Installing '%s'...\n", path);
	if (strlen(path) < 9 || strncmp(path, "/sideload", 9) != 0) {
		gui_print("Checking for MD5 file...\n");
		md5sum.setfn(strpath);
		md5_return = md5sum.verify_md5digest();
		if (md5_return == -2) { // md5 did not match
			LOGERR("Aborting zip install\n");
			return INSTALL_CORRUPT;
		}
	}

#ifndef TW_OEM_BUILD
	DataManager::GetValue(TW_SIGNED_ZIP_VERIFY_VAR, zip_verify);
#endif
	DataManager::SetProgress(0);

	MemMapping map;
	if (sysMapFile(path, &map) != 0) {
		LOGERR("Failed to sysMapFile '%s'\n", path);
        return -1;
    }

	if (zip_verify) {
		gui_print("Verifying zip signature...\n");
		ret_val = verify_file(map.addr, map.length);
		if (ret_val != VERIFY_SUCCESS) {
			LOGERR("Zip signature verification failed: %i\n", ret_val);
			sysReleaseMap(&map);
			return -1;
		} else {
			gui_print("Zip signature verified successfully.\n");
		}
	}
	ret_val = mzOpenZipArchive(map.addr, map.length, &Zip);
	if (ret_val != 0) {
		LOGERR("Zip file is corrupt!\n", path);
		sysReleaseMap(&map);
		return INSTALL_CORRUPT;
	}
	ret_val = Run_Update_Binary(path, &Zip, wipe_cache);
	sysReleaseMap(&map);
	return ret_val;
}